Pump



Dec. 16, 1952 C. MARK, JR

PUMP

4 Sheets-Sheet l Filed Oct. l2, 1945 C. MARK, JR

Dec. v16, 1952 PUMP 4 Sheets-.Sheet 2 Filed Oct. l2, 1945 C. MARK, JR

Dec. 16, 1952 PUMP Filed oct. 12, 1945 4 Sheets-Sheet 5 INVENToR.

C. MARK, JR

Dec. 16, 1952 PUMP 4 Sheets-Sheet 4 Filed 0G17. 12, 1945 INVENTOR.laxgU/Z /Vaf/c J/r, @fw-TW Patented Dec. 16, 1952 PUMP Clayton Mark,Jr., Wilmette, Ill., assignor to Clayton Mark & Company, Evanston, Ill.,a corporation of Delaware Application October 12, 1945, Serial No.621,908

23 Claims. (Cl. 10S- 149) This invention pertains to pumps.

Heretofore there have been a number of types of pumps used to deliverliquid from both deep and shallow wells and for otherwise moving liquid,such as pumps of the centrifugal, turbine, jet, reciprocating,compressed air and gear types. Certain of these pumps are satisfactoryfor pushing liquid, while others are satisfactory for suctioninstallations, but the pumps are not always suitable for various typesof installations.

It is, therefore, an object of this invention to provide a rotary typepump suitable for pumping liquid from either deep or shallow wells andadapted for use as either a suction type pump, or a sump or deep welltype pump.

Another object of the invention is to provide a pump which isinexpensive to manufacture and maintain, is very simple in constructionand has a minimum of moving parts.

Another object of the invention is to provide a pump wherein therotatable parts are in balance, and whereby it is possible to avoid theuse of numerous bearings,

Another object of the invention is to provide a pump wherein frictionbetween the relatively moving parts is reduced to a minimum, and whereinthere is natural lubrication between the engaging surfaces of the rotorand stator.

Another object of the invention is to provide a pump of high eiiiciencythat can be used at any desired pressure, thereby overcomingdifficulties incident to the use of centrifugal, and jet pumps.

Another object of the invention is to provide a pump so constructed thatit is capable of pumping sandy or muddy water, such as is necessary inclearing out a well, the pump being capable of pumping such sludgewithout damage to the Dump.

Another object oi the invention is to provide a pump comprising a rotorand stator wherein the stator is so arranged that it acts as a bearingfor the rotor.

Another object of the invention is to provide a pump which can beoperated by any convenient source of energy, such as a motor, gasolineengine, windmill or the like, and wherein the rotor can be operated atany practical, desired speed.

Another object oi the invention is to provide a pump that isself-lubricating and wherein a steady stream of liquid is deliveredinstead oi a pulsating stream.

With these and various other objects in view, the invention may consistof certain novel features of construction and operation as. will be morefully described and particularly pointed out 2 in the specication,drawings and claims appended hereto. Y

In the drawings which illustrate embodiments of the device and whereinlike reference characters are used to designate like parts- Figure 1 isa fragmentary sectional elevation showing a pump embodying the inventionapplied to the suction pipe of a well and wherein the pump is utilizedas a suction pump;

Figure 2 is a fragmentary sectional elevation showing the adaptation ofthe pump embodying the invention to a deep well installation; Y

Figure 3 is an enlarged sectional elevation through one form of pumpembodying the invention, the section through the stator being takensubstantially in the plane as indicated by the line 3-3 of Figure 4Figure 4 is a top plan View of the stator of the pump illustrated inFigure 3;

Figure 5 is a top plan View of a modified form of stator for a pumpembodying the invention;

Figure 6 is a top plan view of another modified form of stator for apump embodying the invention;

Figure 7 is an enlarged sectional elevation through another form of pumpembodying the invention, the section through the stator being takensubstantially in the plane as indicated by the line 1-1 of Figure 8;

Figure 8 is a top plan view of the stator of the pump illustrated inFigure 7 Figure 9 is an enlarged sectional elevation through anotherform of pump embodying the invention, the section through the statorbeing taken substantially in the plane as indicated by the line 9-9 0fFigure 10;

Figure 10 is a top plan view of the stator of the pump illustrated inFigure 9;

Figure 1l is an enlarged sectional elevation through another form ofpump embodying the invention, the section through the stator being takensubstantially in the plane as indicated by the line H-II of Figure 12;

Figure 12 is a top plan view of the stator of the pump illustrated inFigure 11;

rFigure 13 is an enlarged sectional elevation through a modied form ofstator for a pump embodying the invention, the section through thestator being taken substantially in the plane as indicated by the line`l3-l3 of Figure 14;

Figure 14 is a top plan view of the stator illustrated in Figure 13;

Figures 15 and 16 are velevations of modified forms of rotors adaptedfor use with the stator illustrated in Figures 13 and 14;

Figure 1'7 is a top plan view of the rotor illustrated in Figure 16Figure 18 is an enlarged sectional elevation through another form ofpump embodying the invention, the section through the stator being takensubstantially in the plane as indicated by the line Iii-l Si of Figure19;

Figure 19 is a bottom plan View of the pump illustratedin Figure 18Figure 20 is a sectional elevation of another modied form of pumpembodying the invention, the pump shown being a double acting type ofpump, taken on line 2li- 2li of Figure 21;

Figure 21 is a top plan View of thepump shown in Figure 20; and

Figure 22 is a transverse sectional elevation of the pump shown inFigure 20, the same being taken substantially in the plane as indicatedby the line 22--22 of Figure 20.

While two types of installations are illustrated in Figures 1 andZ, itis of course, understood that other types of installations arecontemplated, such as a suction pump for petroleum products, or a sumppump for petroleum products. However, in Figure l an adaptation isillustrated wherein a suction type of pump is utilized, while in Figure2 there'is illustrated a type of pump for a deep well installation. ThusFigures 1 and 2 illustrate in principle different typical installations.

In Figure 1 the suction pipe Sil extends below the ground level 32 andis provided adjacent its lower end with the well point 34 which extendsinto-the water strata 35i. The upper end of the pipe 3B is connected tothe inlet 33 of the pump 4i). The pump 4I! is provided with the stator42, a portion of which forms a part of the pump casing, and the rotor 44is adapted to rotate therein. The upper end of the pump casing isprovided with the outlet 46 connected to the delivery'pipe 48. Thepropeller shaft 5@ is connected to the rotor 44 and extends through asuitable stuffing box 52 provided in the pump casing and is adapted tobe rotated by the motor-54.

While-a motor is shown in Figures l and 2, it is of course understoodthat any source of energy can be used, such as an electric motor, gasengine, windmill, etc. The rotor and stator are formed such as isparticularly shown in Figures 3 to 20 L inclusive, and the operationthereof will be more particularly described with respect to these gures.

Rotation of the rotor 44 by means of the motor 54 causes suction to liftthe liquid through the suction pipe 3! into the suction chamber 55 ofthe pump, being then pumped by the cooperative relation between therotor and stator to the pressure chamber d from whence it is deliveredto the discharge pipe 48.

In the construction illustrated in Figure 2 the casing Bil extends belowthe ground level 62, being closed by the welly cap 64, said casingextending to a point substantially below the liquid level 66 wherebyliquid is adapted to enter the lower end of said casing. Drop pipe 6Bextends through the well cap 64 and downwardly within the casing (iii,and the sections of the drop pipe may be connected as desired as bycouplings 'IIL The lower end of the drop pipe isiconnected as at 'I2 tothe outlet of the pump casing I4.

The casing 'I4 is provided with the stator l5 of the construction suchas shown in Figures 3 to 20` inclusive, to be later more particularlydescribed', and the inlet of the casing is connected as at 'I8 t0 thesuction stub 80 provided with the foot valve 82. The rotor B4 isrotatably mounted in the stator 'I6 and is adapted to be rotated by theline or propeller shaft 8B which extends upwardly, provided withsuitable bearings Sil connected through suitable spiders at couplingslil, the upper end of the propeller shaft passing through the stuffingbox 92 provided in the outlet tting 94, being driven by the motor 96. Asbefore pointed out, any source of energy may be used instead of themotor 96.

Rotation of the shaft 88, therefore, causes rotation of the rotor 34which in turn causes the liquid to be Ysupplied by the rotor 84 to thepressure chamber It!) of the pump casing from whence it is pumpedupwardly through the drop pipe, being deliveredto the outlet Ell.

In the modication illustrated in Figures 3 and 4, the stator IGZcomprises the outer metallic shell m4 to which is bonded the innerstator member ISS, said member being of resilient kmaterial and beingprovided 'with a resilient seal means iil` which is a partition oriiange biased inwardly of member IIl and extending lengthwise of thecasing so that in effect it is 'a helical thread of innite pitch.

The seal IGS is adapted to be received within the recess II!) formed inthe member |06 whereby when the member M38 is moved wholly within therecess I Iii, a substantially circular inner surface is provided. Therotor I I 2 is adapted to rotate within the stator, a suitable shaftbeing secured thereto as by the thread H4, `and said rotor is providedwith a helical thread HE, said thread extending within the stator forsubstantially two and one-fifth (2l/'5) turns, i. e., for at least twoturns, plus an arc suiiicient to span the seal Hi8. The outside diameterof the helical thread II makes a liquid tight ilt with the internaldiameter of the stator and rotation of the thread causes the resilientseal Il to serially or gradually move within the recess I Iii from theinlet to the outlet as shown at IIS. In operation, therefore, the liquidbetween the body of the rotor and the internal diameter of the stator isconned by the adjacent turns of the helical thread into a long helicalpassageway extending from the inlet I to the outlet IZZ. Upon rotationof the rotor the seal Ill closes off this passageway to the inlet andforces the liquid up the channel to the outlet and upwardly between thethreads and stator -to the outlet. While the rotor II2 is disclosed as ametallic member and the inner stator member It is disclosed as aresilient member, it is of course understood that the rotor may becomposed of resilient material with sealing means and recess such asIdil and III), and the stator member I can be metallic and provided withan internal helical thread comparable to thread IIS.

In the modification illustrated in Figure 5 the stator comprises theouter cylindrical metallic casing member I24 and the inner resilientmember IZB bonded thereto. A rotor similar to rotor II 2 is adapted tobe used with the stator and instead of being provided with one seal IGS(Figure 4) and one recess I IIB, the resilient member |26 is providedwith a plurality (shown ve) of seals I 28 each adapted to be received ina recess I upon movement of the rotor. In this instance the rotor,comparable to rotor II 2, is provided with a thread which extends for360 plus a sui'iicient distance to insure one seal being closed at alltimes, i. e., at least 360, plus the spanning of two seals, orapproximately one andl two iifthsl (1%) turns within the stator. In thisinstance, as well as in Figure 4, the thread is determined so as toclose. the passageway at two places between the inlet and outlet.whereby the sealing means will force the water along the passageway asthe seal is gradually received in recess l or |30 from inlet to outlet.

The passageways from inlet to outlet in Figure 5, as well as inFigure 4,are formed between the helical-'threads ofthe rotor (or stator in casethe parts are reversed) and the rubber element which forms the sealingmeans.

In the pump illustrated in Figure 6, the iiuid passageways are notformed between the rotor and stator, butin the stator itself. In Figure6 the stator comprises the outer metallic member |32 and the innerresilient stator member |34 bonded thereto; The inner member |34 isprovided with the inner cylinder portion |36 connected to the outercylinder portion |38 of the member |34 by the substantially diagonallyextending partition members |40, similar to members |28, each of saidmembers |40 being adapted to be depressed into recess |42. Passagewaysfor the liquid to be pumped are thus formed wholly7 in the resilientelement and the helical thread ofthe rotor acts as the sealing means t0progressively collapse the passageways to force the liquid along saidpassageways. The rotor is provided with a thread of one and threefifths(1%) turns within the stator, i. e., at least one turn, plus the Widthof the two passageways.

In Figures 7 and 8 a form of pump is shown which is designed to operateat higher pressures than the single seal pump shown in Figure 4. In thispump the stator comprises the outer cylindrical metallic member |44 andthe inner resilient member |46 bonded thereto. At a predetermined pointon the inner surface of the member |46 there is provided a partition |48extending the length of the member |46, the partition v|48 forming withthe member |46 a passageway |50 of substantially segmental shape. Thepartition |48, as well as the partitions of the other modifications,preferably is so shaped that when the partition is displaced by thehelical rotor, it ts within the recess formed by passageway |50 so thatthe inner surface of the partition forms a continuous circle with theinner surface of the member |46, so that when the partition is moved toengage the arcuate portion of the passageway |50 (as it is of segmentalshape), the partition exactly fits, whereby there is substantially thesame thickness of member |46 continuously for 360. Thus the helicalthread |52 of rotor |54 revolves against an essentially uniformdiameter.

As before, the rotor is provided with connecting means |56 whereby itmay be rotated and the seal (partition) must be crossed at least twice,plus the width of the seal or partition, by the helical thread withinthe stator. In this case rotation of the rotor entraps anon-compressible body of liquid in the passageway |50. The resilientmaterial, being non-compressible, causes the sealed-off section of thematerial to lll the space between the successive thread crests of thehelical screw and upon rotation of the rotor forces the liquid betweenthreads from inlet |58 to outlet |60.

Thus the liquid is pumped both through the:

this type of pump is a combination of that of 6 the pump illustrated inFigures '3 and 6, that is, the helical thread acts as a seal for theliquid forced up passageway |50 and at the same time passageway |50 actsas a seal forcing the liquid up the passageways formed in the rotorbetween the adjacent turns of the thread. Therefore,

there is excellent lubrication for the rotor, and 1 as the seal is madeof non-compressible material, increased pumping pressure advances thesealing point to a' point where it will hold the pumping pressure.

In the constructions illustrated in Figures 9 to 12 inclusive, thestator comprises the outer cylindrical metallic member |62 and theinnerv resilient member |64. Member |64 is p-rovided with ve seals, thatis, five partitions |66 are molded in the resilient member providingfive passageways |68, said passageways extending from the entrance |10to the outlet |12.

In the construction illustrated in Figure 9, the rotor |14 is providedwith the helical thread |16 and means |18 for connection to a driveshaft, the thread |16 in this case makes at least oneA and one-fifth(1%) revolutions within the stator plus a suiicient amount to overlapone partition or seal. Thus the thread makes substantially one andtwo-fifths (1%) revolutions in order that the operating seal Will beclosed twice in any possible position of the rotor. The thread thereforin the pump illustrated in Figures 9A and l0 can be much steeper thanthat shown in Figure 7 for example, so that one revolution of the rotorwill deliver more liquid. n

In this instance the rotor would operate one seal |66 at any oneinstance. If the rotor illustrated in Figure 7 were used in Figure 9 theamount of liquid delivered would be the same as that delivered by thepump in Figure 7, but there would be ve seals operating at any oneinstance, so that the pump would deliver ve times the operating pressureof the single seal pump and still deliver the same quantity of liquid.

The pump can be made with one or more seals built in the stator and allof them can be operated by a rotor having one or more threads. More thanone thread is desirable on the rotor as it is then possible to obtain abalance of pressure on the sides of the rotor and stator.

While single thread rotors operate satisfactorily at low head pressuresin a stator with any number of retractible seals, the forces acting onthe rotor will not be balanced and high head pressure will tend to forcethe rotor out of center with respect to the stator. This will tend tocause a vcondition of vibration. Bearings can, of course, be used, butto eliminate the use of bearings, the rotor should be designed 'so thatthe forces acting on the rotor are balanced. This can be accomplished bydesigning the rotor with two or more threads and operating it in astator with an equal number of retractible seals, or a number ofretractible seals that are a multiple of the number of threads on therotor.

The capacity of the pump per revolution can be decreased and its workingpressure increased by lessening the pitch of the threads on the rotor,providing the longer threads cross more seals. The same objectives canalso be accomplished by increasing the diameter of the body of the rotorwhich will decrease the liquid delivered per revolution and strengthenthe sealing means.

Further, it will be noted in the construction shown, the helices oftherotor and stator must notmatch and can be any pitch except z'ero.l

7. Where the passages are f'helically disposed` (Figures-13 land 14) therotor may be provided with spaced-parallel axially disposed crests orprojections (Figures 16'and 17) which may be described as threads with apitch of iniinity.

A single seal pump that is 72 across the seal and with a single threadrotor of two and onefth (2 1k.) revolutions will give one sealing pointand a unit capacity. Arotor of three and onefth (3l/5) turns in a singleseal pump of the same length will give only 68.8% as much liquid, butcan pump twice the pressure, as it is double sealed. A four 'andvone-fth (4%.) turn rotor in the same stator will deliver 52.5% as muchliquid as one` with a twoand one-fth (2 1/5) turn rotor, butwill pumpthree times the pressure. Comparing this lone-seal pump with a ve sealpump, if both have a single thread rotor with one sealing point, therotor of the one seal pump must have two and one-fifth (2l/5) turns andthe rotor of the ilve seal pump must have one and two-fifths (1%) turns.The ve seal pump will, therefore, pump against the same pressure butwill deliver 1.57 times as much liquid per revolution as the singlesealpump.

Again, if it is desired to use the same stators and single thread rotorsto pump against twice they delivery pressure, the rotor on the singleseal pump would have three and one-fifth (3 1/5) turns and the rotor onthe ve seal pump would have one and three-fifths (13/5) revolutions ofthe single thread, the five seal pump would, therefore, deliver twicethe liquid of the one seal pump.

Comparing the capacity of the single seal pump against the five sealpump, working against the same head pressure or each with one sealingpoint, the one seal pump using a single thread, and the ve seal pumpusing ve threads as shown in Figure 11, with ve threads, each threadwould have three-fifths (375) of a revolution against the single sealpump with two and one- 'lfth (2l/5) revolutions. In this instance thestator |80 is provided with shaft securing means |82 and five helicalthreads |84. It, therefore, would deliver 3.67 times as much liquid.

Thus itl may be said that a single seal pump is illustrated in Figures 3and 7, while a ve seal pump is illustrated in Figures 5, 9 and 11.However, the pump can be built with any number of seals, either insingle, double or multiple rows until practically all of the liquidflows up the tubular seals `(passageways) with. justsuflicient liquidbeing pumped adjacent the rotor to provide adequate lubrication.

In the pump shown in Figures 13 and 14, the casing |86 of metal isprovided withthe resilient stator |88 bonded thereto, the stator beingprovided with partitions- |90, shown ve in number, forming thepassageways |92.

In this case the passageways are formed helically. Rotor |94 (Figure l5)may be utilized with. the stator illustrated in Figures 13 and 14, therotor being provided with securing means |36 for attachment to asuitable propeller shaft. In this case the rotor is a iive thread rotor,being provided with the threads |98, and where used with theA statorshown in Figure 13 threads |38 must not match the helical passages ofFigure 13 where they contact the partitions of the stator.

The rotor shown in Figures 16 and 17 may also be utilized, the rotor 200being provided with securing means 204 for attachment to a propellershaft for rotating the rotor. In this case the rotor is yprovided withfive threads 206 of infinite pitch that is, the threads, crests orspaced ribs or projections 206 are parallel to eachother and to thelongitudinal axis of the rotor (axis of rotation), extending in thedirection of said axis. Rotation of either of the `rotors illustrated inFigures'15 or 16 serially operates the partitions |90 (gradually closesthe passageways from inlet to outlet) for forcing liquid from the inlet208 of the stator illustrated in Figures 13 and 14 to the outlet 2|0,the liquid passing lupwardly of the passageways and upwardly between therotor and stator. l y

In the pump illustrated in Figures 18 and 19 the metallic stator 2|2 isprovided with a helical thread 2M extending from the inlet 2|6 to theoutlet 2|8'. The rotor 220, of resilientv material, is provided withthese'curing means 222 on rod 22| secured to the rotor for fastening therotor tol a suitable propeller shaft, and said rotor is providedv withthe outwardly extending partitions 224 forming passageways '226. Therotation of the rotor then causes the passages to be serially collapsed(closed gradually from inlet to outlet), forcing the liquid from theinlet 2|6 to the outlet 218 up said passageways 226 and up thepassageways 228 between the rotor and the successive turns on thestator.

Referring now to the double acting pump shown in Figures 20 to 22, saidpump includes a metallic casing 300 adapted to be connected at its upperend to dispensing means (not shown), the lower end being provided withthe spider 302. The lower end of the casing may be connected to asuction stub or pipe as shown in Figures 1 and 2.

The spider 3D2 is provided with the openings 304, and is provided kwiththe xed center post 306 extending upwardly of the casing. The centerpost supports the inner resilient stator 308 which in the embodimentshown is provided with the flanges or partitions 3 I 0 (of any numberand disposition) biased outwardly to form passageways 3I2.

The rotor 3|!! is rotatably disposed to embrace the inner stator, beingprovided with the internal thread 3|6 extending for at leastsubstantially two turns adapted to gradually close the passageways ofthe inner stator from the inlet 3| to the outlet 320kk to pump liquidupwardly, as described. The upper portion of the rotor is provided withapertures 322 for permittingthe upward passage of liquid and the rotoris provided with securing means 324 for attachment to a suitablepropeller shaft.

The outer casing 300 is provided with the resilient outer stator 326,bonded to said casing and provided with the inner flanges or partitions328 biased inwardly providing passageways 330 extending from inlet 3|8to outlet 320. The rotor is provided with external threads 332 similarto threads 3|6 for gradually closing said passageways 330 from the inletto the outlet to pump liquid upwardly of the outer stator.

Though inner and outer flanges 3||| and 320 are shown, it is of courseunderstood that partitions as shown in Figure 12 may be used and alsothe parts may be reversed on rotor and stators.

In operation, therefore, the rotor operates in a concentric manner aboutthe axis of the stator and rotation of the rotor serves to graduallyclose the inner and outer passageways from inlet to outlet, as describedwith respect to the other modifications, causing upward pumping of theliquid through the stators by the rotor and between the stators androtor, the inner and outer stators causing, in effect, a double actionof pumping by the pump.

In order yto increase delivery pressure and to meet high head pressures,the pumps shown herein may be slightly modiiied in one or more ofthe'following different ways. The rotor may be slightly tapered,enlarging toward the outlet. The stator may be tapered, constricting thepassageways toward the outlet. The sectional area of the passageways maybe decreased toward the outlet. The pitch of the threads may beprogressively reduced from the inlet to the outletl on either the rotoror stator.

In the forms of pumps shown, the primary elements are a rotor and astator, each being provided With a helical element of any pitch exceptzero and even includes spaced elements extending axially of the rotor asis shown in Figure 16. One element-is preferably made of rigid materialsuch as a metal, examples of which are stainless steel, brass, etc.,that is, one preferably that is rustless, the other part being made of aresilient material, which is provided with a retractible or collapsibleseal, said resilient material being chosen in accordance with the liquidto be pumped and may be natural rubber, synthetic rubber, plastics, orcompounds thereof. The resilient material is chosen to have long life,to be resilient and to be resistant topetroleum products and othercorrosives, and such material is substantially non-compressible.

Also it is noted that while metal is recited as being used to form therigid member, other substitute material may be used as rigid material ofplastic, etc. Further, while certain types of re- -tractible seals areshown, any type of seal may be used.

Further, the rotor can be rotated as fast as desired, from a standpointof the life of the rubber. Insofar as motors are concerned at thepresent time, approximately 1,750 R. P. M. has been -found to be a goodeconomical speed, though other prime movers rotating at other speeds maybe used.V f

It is to be understood that this application is -not to be limited bythe exact embodiments of -the deviceshown, which are merely by yway ofillustration and not limitation as various and `other 'forms ofthedevice will, of course, be apparent to those skilled in the art withoutdeparting from the spirit of the invention or the scope of the claims. V

I claim: Y

l. An axially progressive rotary pump comprising a propelling member anda sealing member mounted for concentric rotation with respect to oneanother, said propelling member havingV Va channel portion, said sealingmember havinga resilient sealing portion slidably engaging said channelportion, at least one of said portions being helical, said engagementbetween Seid P01'- tions progressing axially upon concentric rotationbetween said propelling member and'said sealing member, forcing fluid insaid channel to progress axially, and means for rotating 011e f saidmembers with respect to the other.

2.`An axially progressive rotary. pump com.- prising a resilient memberand a rigid member adapted for relative concentric rotation, .means -forrotating one of said members-'with' respect'to the other, said rigidmember 'being plOYl-ed Wm? atleast one channel portion, said resilientmember having a sealing portion havingsliding engagement with said rigidmember to divide said channel into at least one fluid-tight compartmentformed in part by said rigid member and in 'part by said sealing means,at least one of Sld 10 portions being helical, said compartmentprogressing axially upon relative concentric rota.- tion between saidmembers.

3. An axially progressive rotary pump comprising a resilient member anda rigid member adapted for relative concentric rotation, means forrotating one of said members with respect to the other, said rigidmember being provided with at least one thread element extendingradially thereof to provide a channel portion, said resilient memberhaving at least one sealing portion extending into slidable sealingengagement with said rigid member to divide said channel into at leastone fluid-tight compartment formed in part by said rigid member and inpart by said sealing portion, one of said portions extending generallyhelically with respect to said members whereby said compartmentprogresses axially of said members upon relative concentric rotationtherebetween.

4. An -axially progressive rotary pump comprising a resilient member anda rigid member adapted lfor relative concentric rotation-means forrotating one oi' said members with respect to the other, said rigidlmember'being provided with a plurality of thread elements extendingradially thereof to provide channel portions, said resilient memberhaving at least one sealing portion extending int-o slidable l.sealingengagement with said rigid member to divide said channels intorluid-tight compartments formed in parl? by said rigid member and inpart by said sealing portion, one of said portions extending generallyhelically with respect to said members whereby said compartmentsprogress axially of said members -upon relative concentric rotationtherebetween.

5. An axially progressive rotary pump comprising a resilient member anda rigid member adapt- -ed i'or relative concentric rot-ation, means forr0- tating lone of' said members with respect to the other, said rigidmember being provided with at least one thread element extendingradially thereof to provide a channel portion, said resilient memberhaving a plurality of sealing portions extending into slid-able sealingengagement with said rigid member to divide said channel intoiluid-tight compartments formed in part by said rigid member and in partby said sealing portions, one of said portions extending `generallyhelically with respect to said members whereby said compartmentsprogress axially of said members upon relative concentric `rotationtherebe. tween.

An axially progressive rotary pump comprising a resilient member and arigid member adapted for relative concentric rotation, means forrotating one of said members with respect to the other, said rigidmember being provided with a plurality oi' thread elements extendingradially thereoi` to provide channel portions, Isaid resilient memberhaving a plurality of sealing portions extending into slidable sealingengagement with said rigid member to divide said channel intoViiuid-tight compartments formed in part by said rigid member and in partby said sealing portions, one of said portions extending generallyhelically with respect to said members whereby said compartmentsprogress axially of said members upon relative concentric rotationtherebetween. n 1

7. An axially progressive rotary pump comprising a resilient statormember land a rigid rotor member mounted lfor concentric rotationtherein, means for rotating said rotor member,

said rotor member being formed. with at least one helically arrangedthread element extending radially thereof to provide a channel portion,said stator member having at least one sealing portion extending intoslidable sealing engagement with said rotor member to divide saidchannel portion into at least one fluid-tight compartment formed in partby said rotor member and in part by said sealing portion whereby saidcompartment progresses axially of said members upon rotation of saidrotor member.

8. An axially progressive rotary pump comprising a resilient statormember and a rigid rotor member mounted for concentric rotation therein,means for rotating said `rotor member, said rotor member being formedwith a plurality of helically arranged thread elements extendingradially thereof to provide channel portions, said stator member havingat least one sealing portion extending into slidable sealing engagementwith said rotor member to divide said channel portions into fluid-tightcompartments formed in part by said rotor member and in part by saidsealing portion whereby said compartments progress axially of saidmembers upon rotation of said rotor member.

9. An axially progressive rotary pump comprising a resilient statormember and a rigid rotor member mounted for -concentric rotationtherein, means for rotating said rotor member, said tending into sealingengagement with said rotor 2,-.

member to divide said channel portion into fluid tight compartmentsformed in part by said rotor member and in part by said sealing portionswhereby said compartments progress axially of said members upon rotationof said rotor member.

10. An axially progressive rotary pump comprising a resilientstatormember and a rigid rotor member mounted for concentric rotation therein,means for rotating said rotor member, said rotor member being formedwith a plurality of helically arranged thread elements extendingradially thereof to provide channel portions, said stator member havinga plurality of sealing portions extending into slidable sealingengagement with said rotor member to divide said channel into Huid-tightcompartments formed in part by said rotor member and in part by saidsealing portions whereby said compartments progress axially of saidmembers upon rotation of said rotor member.

11. An axially progressive rotary pump comprising a rigid stator memberand a resilient rotor member mounted for concentric rotation therein,means for rotating said rotor member, said stator member being formedwith at least one helically arranged thread element extending radiallythereof to provide a channel portion, said rotor member having at leastone sealing portion extending into slidable sealing engagement withsaidistator member to divide said channel portion into at least onefluid-tight compartment formed in part by said stator member and in partby said sealing portion whereby said compartment progresses axially ofsaid membersvupon rotation of said rotor member.

12. A n axially progressive rotary pump, comprisingha rigid statormember and a resilient rotor member mounted for concentric rotationtherein, means for rotating saidroto'r member,

said stator member being formed 'with a plurality of helically arrangedthread elements extending radially thereof to provide channel portions,said rotor member having at least one sealing portion extending intoslidable sealing engagement With said stator member to divide saidchannel portions into fluid-tight compartments formed in part by saidstator member and in part by said sealing portion whereby saidcompartments progress axially of said members upon rotation of saidrotor member.

13. An axially progressive rotarypump comprising a rigid stator memberand a resilient rotor member mounted for concentric Yrotation therein,means for rotating said rotor member, said stator member being formedvwith at least one helically arranged thread element extending radiallythereof to provide-a channel portion, said rotor member having aplurality o sealing portions extending into slidable sealing engagementwith said `stator member to divide said channel portion into fluid-tightcompartments formed in part by said stator member and in part by saidsealing portions whereby said compartments progress axially of saidmembers upon rotation of said rotor member.

14. An axially progressive rotary pump comprising a rigid stator memberand a resilient rotor member mounted for concentric rotation therein,means for rotating said rotorimember, said stator member being formedwith a plurality of helically arranged thread elements extendingradially thereof to provide channel portions, said rotor member having aplurality of sealing portions extending into slidable sealing engagementwith said stator member to divide said channel portion into fluid-tightcompartments formed in part by said stator member and in part by saidsealing portions whereby saidl compartments progress axially of saidmembers upon-rotation of said rotor member.

15. An axially progressive rotary pump according to claim 3, in whichthe rigid member is provided With at least one ,helically arrangedthread and in which the resilient member is provided with a plurality ofsealing portions extending into slidable sealing engagement withthekrigid member each comprising a deformable Apartition forming in parta passageway extending axially of the resilient member.

16. An axially progressive rotary pump according to claim 3, in Whichthe rigid member constitutes a rotor and is provided with an helicallyarranged thread and in'which the resilient member constitutes a part ofa stator having a plurality of sealing portionsextending into slidablesealing engagement withthe rotor each of which comprises a deformablepartition forming in part a passageway extending axially of the stator.

17. An axially progressive rotary pump according to claim 3, in whichthe rigid member is provided with at least one helically arranged threadand in which the resilient member is provided with a sealing` portionextendinginto slidable sealing engagement with the rigid member andcomprising a deformable partition forming in part a passageway extendingaxially of the resilient member.

18. An axially progressive rotary pump according to claim 3, in whichthe rigid member constitutes a rotor and is provided with an helicallyarranged thread and in which the resilient member constitutes apart of astator having a sealing portionl extending into slidable sealingengagement With the rotor .and comprisingafde- 13 formable partitionforming in part a passageway extending axially of the stator.

19. An axially progressive rotary pump according to claim 3, in whichthe rigid member is provided with at least one helically arranged threadand in which the resilient member has inner and outer tubular portionsinterconnected by substantially diagonally extending partitions toprovide a plurality of passageways extending axially thereof whereby oneof the tubular portions form sealing portions extending into slidablesealing engagement with the rigid member.

20. An axially progressive rotary pump according to claim 3, in whichthe rigid member constitutes a rotor and is provided with at least onehelically arranged thread and in which the resilient member constitutesa part of a stator and has inner and outer tubular portionsinterconnected by substantially diagonally extending elastic partitionsto provide a plurality of passageways extending axially thereof, theinner tubular portions being elastic and extending into slidable sealingengagement with the rotor.

21. An axially progressive rotary pump according to claim 3, in whichthe rigid member constitutes a stator and is provided with at least onehelically arranged thread on the inner surface member is provided by adeformable flange forming in part a recess extending axially of theresilient member and connected to the resilient member adjacent one sideof the recess.

23. An axially :progressive rotary pump according to claim 3, in whichthe rigid member constitutes a rotor and is provided with at least onehelically arranged thread and in which the resilient member constitutesa stator having a recess extending axially adjacent the inner surfacethereof defined in part by a straight flange connected to the resilientmember adjacent one side of the recess and extending inwardly thereof toprovide a sealing portion extending into slidable sealing engagementWith the rigid member.

CLAYTON MARK, JR.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 1,874,667 Wada Aug. 30, 19322,015,123 Pennell Sept. 24, 1935 2,028,407 Moineau Jan. 21, 19362,258,371 Wernert Oct. 7, 1941 2,293,268 Quiroz Aug. 18, 1942 2,336,580Yeatman Dec. 14, 1943 2,409,688 Moineau Oct. `22, 1946 FOREIGN PATENTSNumber Country Date 1,746 Great Britain 1854 113,009 Australia Apr. 28,1941 443,134 Great Britain Feb. 21, 1936 484,479 Great Britain May 2,1938

